273 said

Displacement / 8 / valve size x .91 then minus that answer from 128

340/8/2.02x.91 = 19.14, 128 - 19.14= 108.85 lsa for a 10.5:1 340 engine for every point of cr different add or subtract .75 lsa so for 9.5:1 340 108.1 lsa or 108

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